Dual-rotation modulation technique - based inertial sensor
The invention provides an inertial sensing device the capability to achieve self-alignment (sensor error compensation), by using dual-rotation modulation technique. The self-alignment process is performed based on fully building the sensor's mathematical model and rotating the inertial sensor blocks in a specific order. The advantages of this technology are fast calibration time, high accuracy, and the ability to separate independent movements on the axes of the inertial sensor. The inertial sensor based on a dual-rotation modulation platform is applied to marine and aeronautical fields.
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The calibration process of inertial systems is extremely important. The misalignment angle and sensor error cause large deviations in the convergence, which reduce the accuracy of the inertial navigation algorithm's results. Therefore, the improvement of the correction calibration will significantly increase the performance of the inertial navigation system.
In recent years, sensor error compensation technology has been widely used in the field of inertial navigation. In particular, some popular and innovative technologies are capable of overcoming and correcting the initial errors of the inertial navigation system, as follows:
Chinese patent CN106500694, published on Mar. 15, 2017, by LI JIE et al., provides a miniature rotary micro-inertia measuring device. This structure can't compensate for the error on all axes of the inertial sensor, especially since the error is always changing over time, which makes this navigation system's accuracy gradually decrease.
Chinese patent CN109029500, published on Dec. 18, 2018, by JI CUIPING et al., provides a self-calibration method based on dual-axis rotary modulation system. A three-axis inertial sensor will be rotated on a two degrees of freedom platform, thereby estimating all axes's error. However, the inertial navigation process and continuous calibration can't be implemented simultaneously, so the positioning accuracy still decreases over time.
SUMMARY OF THE INVENTIONTo overcome the disadvantages of the previous inventions, the authors propose an inertial sensor's mechanism with two independent axes of rotation, which allows the system to be able to perform two processes at the same time: continuous calibration and running the inertial navigation algorithm, thereby increasing the accuracy of the navigation system and reducing the cost compared to sensors with equivalent navigation quality.
Dual-rotation modulation technique-based inertial sensor has the following main components:
-
- The housing;
- Multi-sensor synchronized section;
- Central processing section;
- Positioning signal receiver section.
In this invention, the dual-rotation modulation technique-based inertial sensor combines many critical components, each of which has specific functions and tasks but is closely linked and complements each other to form a unified sensor block.
As the detailed drawing is shown in
The central processing section 3, as depicted in
Similarly,
An inertial sensor is based on a dual-rotation platform consisting of the main components: a housing, a multi-sensor synchronized section, a central processing section, and a positioning signal receiver section. The present invention provides a method of designing the installation of sensors with two independent axes of rotation, facilitating the implementation of sensor self-calibration technologies. Therefore, despite using inexpensive, easily accessible components on the market, inertial sensor based on dual-rotation modulation technique has achieved accuracy comparable to high-precision class expensive sensors.
Claims
1. An inertial sensor based on a dual-rotation platform, comprising the following: a housing, and three components, a multi-sensor synchronized section, a central processing section, and a positioning signal receiver section, in which:
- the housing includes six plates: a base plate, a connector plate, a circuit plate, a sensor plate, a motor plate, and a cover plate, outside the housing, a number of connection ports, a number of indicator lights, and a number of positioning antennas are arranged on the connector plate, at an inside of the housing, the three components are mounted in the following positions: the multi-sensor synchronization section is placed on the base plate through a large anti-vibration system; the central processing section and the positioning signal receiver section are securely mounted on the circuit plate via a number of anti-vibration systems, a number of wire clips are provided for connecting;
- the multi-sensor synchronized section consists of plural modules, including a base having two perpendicular planes used to shape a posture of the inertial sensor: a first sensor is placed horizontally in a first plane, and a second sensor is placed vertically in a second plane, mounted on each plane of the base are: a motor and a slip ring, a sensor and a sensor reading circuit are driven through a support plate placed on a rotor of the motor, in addition, the base is powered and converted through a DB25-type communication port,
- the sensor reading circuit is a part of the multi-sensor synchronized section, and comprises two parts: a signal part and a source part, the source part has a role of reducing a power voltage from 5V to 3.3V, supplying chips of the sensor reading circuit and the signal part, which convert ones of a synchronous protocol standard signals to a differential form for further transmission;
- the central processing section comprises two main components: a processing circuit and a communication circuit, wherein the processing circuit has a function of calculating and controlling activities of the device, and the communication circuit has a function of supplying power and exchanging signals between the processing circuit and other portions in the sensor, the processing circuit and the communication circuit are mounted together by a number of brass spacers, spring lock washers, and hex socket head cap screws, a heatsink is provided to the processing circuit to transfer heat generated during the circuit's operation to outside of the housing,
- the communication circuit comprises of three main blocks: a power block, a control block, and a converter-communication block, the power block provides an anti-reverse and a low-voltage to supply the modules and the control block, and the converter-communication block, the control block adjusting an output source to perform a motor control function, the converter-communication block communicating, collecting, and processing conversions from blocks and other parts of the inertial sensor;
- the positioning signal receiver section comprises two main components: a signal receiver circuit and a converter circuit, the signal receiver circuit is a GPS circuit, for collecting and processing signals to give positioning results, the converter circuit processing, signal conversion, and reducing voltage to provide to the signal receiver,
- the converter circuit has two main components: a signal processing part and a power conversion part, the power conversion part protecting and reducing voltage to a level, the signal processing part converts the signal of the receiver circuit into differential signals.
Type: Application
Filed: Jan 6, 2023
Publication Date: Jul 20, 2023
Applicant: VIETTEL GROUP (Ha Noi City)
Inventors: XUAN CHIEN VUONG (Ha Noi City), DUC ANH NGUYEN (Ha Noi City), VAN HIEP HOANG (Ha Noi City), HAI NAM TRINH (Tho Xuan District)
Application Number: 18/151,077